Granted Patent
Utility
US 4,770,871 · App. 07/117,293
Process for the preparation of dianhydrosorbitol ethers
Inventor:
James N. Greenshields
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Nov 6, 1987
Inventor
James N. Greenshields
Assignee (at issue)
ICI Americas, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.